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Port 1254 (de-noc)

IANA assigns port 1254 to de-noc.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
de-noc TCP de-noc - -
de-noc UDP de-noc - -

Check what is listening on port 1254

Linux: is anything listening on TCP 1254?
sudo ss -tlnp 'sport = :1254'
Linux: UDP 1254
sudo ss -ulnp 'sport = :1254'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1254
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1254 '
Windows (Command Prompt)
netstat -ano | findstr :1254
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1254 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1254
From Windows
Test-NetConnection HOST -Port 1254
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1254

Block port 1254 in the firewall

ufw
sudo ufw deny 1254/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1254 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1254 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1254' -Direction Inbound -Protocol TCP -LocalPort 1254 -Action Block
ufw
sudo ufw deny 1254/udp
iptables
sudo iptables -A INPUT -p udp --dport 1254 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1254 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1254' -Direction Inbound -Protocol UDP -LocalPort 1254 -Action Block

Related ports

1252bspne-pcc1253q55-pcc1255de-cache-query1256de-server

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.